CN103323641A - Electronic transformer and implementation method thereof - Google Patents
Electronic transformer and implementation method thereof Download PDFInfo
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- CN103323641A CN103323641A CN2013101999244A CN201310199924A CN103323641A CN 103323641 A CN103323641 A CN 103323641A CN 2013101999244 A CN2013101999244 A CN 2013101999244A CN 201310199924 A CN201310199924 A CN 201310199924A CN 103323641 A CN103323641 A CN 103323641A
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Abstract
The invention provides an electronic transformer and an implementation method of the electronic transformer. The electronic transformer comprises a sensing head, a collector and a combining unit. The collector is connected with the sensing head through a shield cable and is arranged on a ground potential side of the electronic transformer, correction factors of the collector are dynamically adjusted according to the performance of a sensor, and the collector is made to be matched with the sensing head. Input signals are collected through a sampling system to obtain digital signals, and the digital signals are output to the combining unit through an optical fiber. The electronic transformer and the implementation method of the electronic transformer achieve seamless connection and accuracy degree lossless interchange of an electronic collecting unit and a sensing unit and simplify a maintenance process. Meanwhile, the electronic transformer and the implementation method of the electronic transformer improve convenience for maintaining the electronic collecting unit, simplify maintaining processes, reduce maintaining and operating cost, prolong the service life of an electronic loop, and is safe, reliable, long in service life and easy to maintain and used for an intelligent power grid.
Description
Technical field
The present invention relates to the mutual inductor technical field, relate in particular to the implementation method of a kind of electronic mutual inductor and electronic mutual inductor.
Background technology
Tradition transformer station faces dynamic measurement scope such as routine transformer and has limitation, lacks unified information model and information exchange model and electric network information is shared be difficult to and realized, lack between the smart machine interoperability, a large amount of secondary cable to the problems such as adverse effect of reliability.Intelligent substation is the developing direction of transformer station's technology, is construction basis and the important component part of strong intelligent grid, and the transformer technology is that applying of intelligent substation laid a good foundation.
Electronic voltage, current transformer (respectively referred to as EVT and ECT) based on the optics and electronics principle with its unique advantage, become the measuring equipment of voltage, electric current under the most rising a kind of ultra-high pressure condition through the development in more than 30 years.Early stage electronic mutual inductor primary side and secondary side come signal transmission by optical fiber, are also referred to as the photo-electric mutual inductor.2002, IEC formulated about the IEC60044-7 standard of EVT and the IEC644-8 standard of ECT according to the development trend of new-style electronic voltage, current transformer, clear and definite definition and the corresponding technical manual of electronic mutual inductor.
According to the IEC60044-7 standard, EVT adopts resitstance voltage divider, and capacitive divider or optical devices utilize optical fiber as the transmission system between primary transducer and the secondary converter as a converting member.And transmission and the amplification that electron device is made measuring-signal is housed, have analog quantity voltage output or digital output.According to the IEC60044-5 standard, adopt conventional current mutual inductor Hall element, Rogowski coil or optical devices as a converting member, utilize optical fiber as the transmission system between primary transducer and the secondary converter, and transmission and the amplification that electron device is made measuring-signal is housed, have analog quantity voltage output or digital output.
Electronic mutual inductor mainly comprises sensing head and electronic unit, and above-mentioned electronic unit mainly comprises collector and merge cells.Relatively traditional mutual inductor life-span of above-mentioned electronic unit is short, difficult in maintenance, changes the field adjustable that cuts off the power supply when electronic unit need to be grown, and this has all seriously hindered the Industry Promotion of electronic mutual inductor, and the development process of intelligent substation.Therefore, how to improve the properties of the electronic unit in the electronic mutual inductor, the various shortcomings that overcome above-mentioned electronic unit are problem demanding prompt solutions.
Summary of the invention
Embodiments of the invention provide the implementation method of a kind of electronic mutual inductor and electronic mutual inductor, to improve the properties of the electronic unit in the electronic mutual inductor.
A kind of electronic mutual inductor comprises: sensing head, collector and merge cells,
Described sensing head, be used for by shielded cable be connected collector and connect, send input signal to described collector;
Described collector, be used for by optical fiber be connected merge cells and connect, be installed on the earth potential side of described electronic mutual inductor, the correction factor of described collector is dynamically adjusted according to the performance of described sensor, and described collector and described sensing head are complementary; By sampling system described input signal is collected digital signal, described digital signal is exported to merge cells by optical fiber;
Described merge cells is used for the digital signal that described collector output is come is merged processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
A kind of implementation method of electronic mutual inductor comprises:
Sensing head is connected with collector by shielded cable, and described sensing head sends input signal to described collector;
Described collector is installed on the earth potential side of electronic mutual inductor, by the correction factor of the described collector of dynamic adjustment, described collector and described sensing head is complementary; Described collector collects digital signal by sampling system to described input signal, and described digital signal is exported to merge cells by optical fiber;
Described merge cells by optical fiber be connected collector and connect, the digital signal that described collector output is come merges processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
Can be found out by the technical scheme that the embodiment of the invention described above provides, the embodiment of the invention is by being installed on collector the earth potential side of electronic mutual inductor, dynamically adjust the correction factor of collector according to the performance of sensor, collector and sensing head are complementary, realized electronics collecting unit and sensing unit seamless link and accuracy free of losses exchange, when simplifying maintenance procedures, improve the convenience that the electronics collecting unit is safeguarded, reduced maintenance and operating cost.Avoided the abominable electromagnetic environment of high-pressure side, prolonged the life-span in electronic type loop, reduced frequency of maintenance, the electronic mutual inductor that safe and reliable, long-life is provided, is easy to safeguard to intelligent grid is for the safe operation of national intelligent grid provides powerful guarantee.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The processing flow chart of the implementation method of a kind of electronic mutual inductor that Fig. 1 provides for the embodiment of the invention one;
The output frame form schematic diagram of the merge cells in a kind of electronic mutual inductor that Fig. 2 provides for the embodiment of the invention one;
A kind of APDU frame structure schematic diagram that has connected 8 ASDU that Fig. 3 provides for the embodiment of the invention one;
The structural representation of a kind of electronic mutual inductor that Fig. 4 provides for the embodiment of the invention two;
The structural representation of a kind of electronic current mutual inductor based on the Luo Shi principle that Fig. 5 provides for the embodiment of the invention two;
The structural representation of a kind of electronic type voltage transformer based on the coaxial capacitance voltage divider principle that Fig. 6 provides for the embodiment of the invention two;
The hardware configuration schematic diagram of a kind of ECVT800E4 series collector that Fig. 7 provides for the embodiment of the invention two;
The port organization schematic diagram of a kind of ECVT800E4 series collector that Fig. 8 provides for the embodiment of the invention two;
A kind of ECVT800E4 series electronic formula current transformer outline overall and installing dimensions figure that Fig. 9 provides for the embodiment of the invention two;
A kind of ECVT800E4 series electronic formula voltage transformer (VT) outline overall and installing dimensions figure that Figure 10 provides for the embodiment of the invention two.
Embodiment
For ease of the understanding to the embodiment of the invention, be further explained explanation below in conjunction with accompanying drawing as an example of several specific embodiments example, and each embodiment does not consist of the restriction to the embodiment of the invention.
Embodiment one
The embodiment of the invention is short serviceable life for the electronic unit collector of electronic mutual inductor, difficult in maintenance, the problem of the sensing head performance parameter property of there are differences, according to electronic loop technology maturation, FPGA(Field Programmable Gate Array, field programmable gate array) reliable, and the advantage that passive transformer for supplying power is convenient, the life-span is long, carry out electronic unit collector and the theoretical research of sensing head configuration conformance of electronic mutual inductor, realize seamless link.
Electronic mutual inductor in the embodiment of the invention comprises sensing head, collector and merge cells, this embodiment provide a kind of electronic mutual inductor implementation method treatment scheme as shown in Figure 1, comprise following treatment step:
By the electronic mutual inductor fault analysis is found, the electronic current mutual inductor fault distributes by type: collector failure rate 43.9% is the maximum source of trouble of electronic mutual inductor; Collector, noise, laser powered sensor loop fault account for total failare 56.7%.Therefore, the collector of electronic mutual inductor exists failure rate height and short problem of life-span.Embodiment of the invention research improves the life-span of collector, simplifies maintenance requirement etc., the reliability of using to improve electronic mutual inductor.
The embodiment of the invention is in conjunction with the implementation of traditional mutual inductor, collector is installed on the earth potential side of electronic mutual inductor, realize the station DC power supply, eliminate the unreliable problem of laser energy supply and collector and be in high-pressure side problem difficult in maintenance, solve the laser module reliability and simplify maintenance scheme, distribute according to fault, directly reduce electronic mutual inductor failure rate 3.2%, improved the maintainability (generally designing below the base of mutual inductor body) of collector.
Comprise in the collector in the embodiment of the invention two-way independently sampling system the input signal from sensing head is gathered; improved the reliability of protection action, met " Q/GDW441-2010 intelligent substation Protection Technology standard " that up-to-date promulgation is netted by state.
Comprise diode, integrating circuit and AD(analog to digital conversion in the sampling system of every road) parts such as circuit, two-way sampling system common buffer, also comprise in the above-mentioned collector: controller, UART(Universal Asynchronous Receiver/Transmitter, Universal Asynchronous Receiver ﹠ dispensing device), two adopt output ports and a sampling pulse input port.When above-mentioned collector is applied in capacitance-resistance and divides the die mould electronic type voltage transformer, by the backoff algorithm of SF6 state, realize accuracy compensation and gamma correction to sensing head.
In above-mentioned collector, also comprise DC(Direct Current, direct current) and LDO(low dropout regulator, low pressure difference linear voltage regulator), above-mentioned DC and LDO can in the situation that do not connect external power source, carry out self power supply to above-mentioned collector.
The embodiment of the invention is utilized the high reliability of FPGA, and the electronic units such as above-mentioned diode, integrating circuit, AD circuit, impact damper, controller and UART are realized by FPGA, and above-mentioned electronic unit all is integrated among the FPGA.
Above-mentioned collector has strong anti-interference ability, takes into full account the relatively abominable running environment of process layer on the design of hardware and software, takes totally-enclosed cabinet, and the anti-vibration ability of device improves greatly, and relevant criterion is also satisfied in external electromagnetic radiation.Each analog channel is taked quarantine measures, eliminates passage and harasses; Optical fiber and digital output antijamming capability is strong, but long-distance transmissions.
The interference free performance of above-mentioned collector is as follows:
(1) radio frequency electromagnetic field radiation immunity experiment: can bear the harsh grade of stipulating among the GB/T17626.3-2006 is the radio frequency electromagnetic field interference of III level.
(2) fast transient interference test: the harsh grade that meets the GB/T17626.4-2008 regulation is that the fast transient of IV level disturbs.
(3) anti-electrostatic discharging interference test: the harsh grade that meets the GB/T17626.2-2006 regulation is that the anti-electrostatic discharging of IV level disturbs.
(4) power frequency magnetic field immunity experiment: the harsh grade that meets the GB/T17626.8-2006 regulation is that the power frequency magnetic field of V level disturbs.
(5) pulse magnetic field immunity test: the harsh grade that meets the GB/T17626.9-1998 regulation is that the pulsed magnetic field of V level disturbs.
(6) damped oscillation magnetic field immunity experiment: the harsh grade that meets the GB/T17626.10-1998 regulation is the damped oscillation magnetic interference of V level.
(7) surge immunity test: meeting the harsh grade of stipulating among the GB/T17626.5-2008 is the surge harassing and wrecking of IV level.
(8) the conduction interference immunity experiment of radio-frequency field induction: the harsh grade that meets the GB/T17626.6-2008 regulation is the radio-frequency field induction conduction interference of III level.
(9) voltage dip, interrupt and the change in voltage test in short-term: should be able to hold that assigned voltage interrupts being 100ms among the GB/T17626.29-2006, voltage dip 40% is the interference test of 1s.
(10) high frequency immunity experiment: should be able to bear the harsh grade of stipulating among the GB/T17626.12-1998 is the interference test of III level.
Above-mentioned collector is mainly used in dividing based on the electronic current mutual inductor of Luo-coil and capacitance-resistance little analog acquisition and the sending function of die mould electronic type voltage transformer.
Sensing head is connected with collector by shielded cable, realizes the seamless link between sensing head and the collector.Above-mentioned shielded cable can be ECVT800L2C type shielded cable.
The correction factor of above-mentioned collector has online dynamically adjustment capability, before electronic mutual inductor dispatches from the factory, for the specific performance of sensing head, dynamically adjusts the correction factor of collector, and collector and sensing head are complementary, and realizes the seamless link of collector and sensing head.Then, the specific performance of the correction factor after the adjustment of described collector and above-mentioned sensing head is carried out association store.
When collector breaks down, need the on-the-spot outage of staff to change, with new collector be connected sensing head and connect, inquire about the information of described association store according to the specific performance of described sensing head, obtain the correction factor after the adjustment of described storage, the correction factor after the described adjustment is written in the described new collector.Thereby the scene of having realized need not to debug direct replacing, realizes that the precision of electronic mutual inductor is harmless.
The output format of above-mentioned collector is standard UART, and the digital signal that obtains is exported to merge cells by optical fiber.ECVT800E4 series collector has 0.1 grade high measurement accuracy.
Communication protocol between above-mentioned collector and merge cells following (asynchronous system transmission)
(1) data communication between collector and merge cells is with reference to the regular length frame format of the FT3 of GB/T18657.1, and the data transmission frame format is seen following table 1.
(2) should adopt multimode optical fiber between collector and merge cells, high-order (corresponding UART spare bits) is defined as " optical fiber goes out ", and low level is defined as " optical fiber is bright ".Transfer rate is 2.0M bit/s or its integral multiple.Sampling rate is 4000Hz.Fibre-optical splice should adopt ST or FC joint.
(3) adopt industrial standard UART circuit to carry out the asynchronous data stream communication.Each character forms by 11, and 1 start bit is " 0 ", 8 data bit, and 1 even parity bit, 1 position of rest is " 1 ".
Table 1
The merge cells digital signal that output is come to collector merges processing; and become Ethernet data by the IEC61850-9-2 standard handovers; output to process-level network or relevant intelligent electronic device by optical fiber again, satisfy the requirement of intelligent substation protection, observing and controlling, metering.
The technical indicator of merge cells is as follows:
(1) specified DC data
220V or 110V allow variation range: 80%～115%.
(2) power consumption
Be not more than 20W.
(2) collector access
Data protocol: follow the Asynchronous Transfer Mode in the power industry standard " merge cells technical conditions ";
Fiber type: 62.5/125um, multimode, ST interface;
Optical wavelength: 850nm;
Receiving sensitivity :-30dbm.
(3) switching value access
The dumb contact access, maximum way 9 tunnel;
Input voltage: DC220V/100V.
(4) IEC61850-9-2 form sampled value output
Data protocol: follow the IEC61850-9-2 standard.
Interface type: fiber optic Ethernet, bandwidth 10M/100M;
Fiber type: 62.5/125um, multimode, ST interface;
Optical wavelength: 1310nm;
Receiving sensitivity :-30dbm.
(5) configuration interface
Electric Ethernet, RJ45 interface, bandwidth 10M/100M self-adaptation.
(6) synchronous base access
The method of synchronization: support synchronizing pulse or IRIG-B code or IEC61588-2009(IEEE1588-2008) PTP agreement;
Input mode: fiber optic Ethernet or light serial ports; 62.5/125um, multimode, ST interface;
Optical wavelength: fiber optic Ethernet, 1310nm; The light serial ports, 850nm;
Second is the time accuracy on edge on time: be better than 1us.
The anti-electrical Interference ability of merge cells is as follows:
The harsh grade that can bear table 1 regulation among the GB/T17626.2-2006 is 4 grades static discharge.
The harsh grade that can bear table 1 regulation among the GB/T17626.3-2006 is 3 grades radio frequency electromagnetic field radiation.
The harsh grade that can bear table 1 regulation among the GB/T17626.4-2008 is that 4 grades electrical fast transient (eft) disturbs.
The harsh grade that can bear table 1 regulation among the GB/T17626.5-2008 is that 3 grades surge impact disturbs.
The harsh grade that can bear table 1 regulation among the GB/T17626.6-2008 is that the conduction interference of 3 grades radio-frequency field induction disturbs.
The harsh grade that can bear table 1 regulation among the GB/T17626.8-2006 is that 5 grades power frequency magnetic field disturbs.
The harsh grade that can bear table 1 regulation among the GB/T17626.9-1998 is that 5 grades pulsed magnetic field disturbs.
The harsh grade that can bear table 1 regulation among the GB/T17626.10-1998 is 4 grades damped oscillation magnetic interference.
The harsh grade that can bear table 2 regulation among the GB/T17626.12-1998 is that 3 grades 100kHz and 1MHz pulse train disturbs.
The classification that can bear table 1 regulation among the GB/T17626.11-2008 is the supply voltage bust of 3 classes and interrupts in short-term disturbing.
The insulating property of merge cells are as follows:
Dielectric strength, all circuit of merge cells can tolerate with the dielectric strength of shell and exchange 50Hz, and voltage 2kV (effective value) last the 1min test, and naked punctures or the flashover phenomenon.
Surge voltage, the current-carrying part of merge cells be between the non-conductive metal part shell that exposes, and under the test atmosphere of regulation, the standard lightning wave that can tolerate amplitude and be 5kV impacts check in short-term.
The mechanical property of merge cells is as follows:
Condition of work, the harsh grade that can bear country or industry standard regulation are vibration and the shock response check of I level.
Traffic condition, the harsh grade that can bear country or industry standard regulation are that the vibration of I level is durable, the durable and Collision detection of impact.
The environmental baseline of merge cells is as follows:
Operating ambient temperature :-25 ℃～+ 55 ℃.
The accumulating environment temperature :-40 ℃～+ 70 ℃, under ultimate value, do not add energizing quantity, irreversible change does not appear in device, and device should be able to work after temperature was recovered.
Relative humidity: 5%～95%(is without condensation).
Atmospheric pressure: 80kPa～110kPa.
Merge cells is followed the output frame form of IEC61850-9-2LE stipulations, and the schematic diagram of this output frame form as shown in Figure 2.In Fig. 2, TPID=0x8100 in the priority flag
Ethernet type is 88-BA
APPID=0x4001～0x7fff
Length: comprise the ethernet type PDU(ProtocolDataUnit that begins with APPID, protocol Data Unit) at the number of eight interior hytes.
APDU(ApplicationProtocolDataUnit, Application Protocol Data Unit): mapping is provided at APDU and is committed to the performance that transmit buffer connected into several ASDU an APDU in the past.Be connected to the ASDU(ApplicationServiceDataUnit of an APDU, the application service data cell) number can configure, and relevant with sampling rate.This embodiment provides a kind of APDU frame structure schematic diagram that has connected 8 ASDU as shown in Figure 3.
The output data of merge cells are followed the coefficient of IEC61850-9-2LE stipulations and are adjusted
Require the SMV INT type data of merge cells output according to the IEC61850-9-2LE stipulations, data represent the size of primary current voltage.
The form of output data is as follows:
LSB
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 1mA | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? |
| 10mV | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? |
MSB
The 0th 2 of 32 lowest order
0Represent 1mA or 10mV, the 31st of most significant digit is sign bit: 0 for+, 1 be-.
The scope that can represent electric current for-2147kA to+2147kA, numerical value is accurate to 1mA; Voltage range that can expression be-and 21474kV arrives+21474kV, and numerical value is accurate to 10mV; Can satisfy the requirement of electric system fully.
The size of merge cells output primary current voltage is to realize by the passage coefficient of adjusting, and the computing formula of the above-mentioned passage coefficient of adjusting is as follows:
Current channel is used in protection: a rated current such as electronic current mutual inductor is I
1e=600A (effective value), the specified 0x01CF=463 that is output as; Passage coefficient co=(600*1000)/463=1295.89633 (accurately rear 5 of radix point) then adjusts.
Measure and use current channel: a rated current such as electronic current mutual inductor is I
1e=600A (effective value), the specified 0x2D41=11585 that is output as; Passage coefficient co=(600*1000)/11585=51.79111 (accurately rear 5 of radix point) then adjusts.
Voltage channel: a rated current such as electronic type voltage transformer is
(effective value), the specified 0x2D41=11585 that is output as; The passage coefficient of then adjusting
(accurately rear 5 of radix point).
Embodiment two
The structure of a kind of electronic mutual inductor that this embodiment provides comprises following unit as shown in Figure 4: sensing head 41, shielded cable 42, collector 43, optical fiber 44 and merge cells 45.
Described sensing head, be used for by shielded cable be connected collector and connect, send input signal to described collector;
Described collector, be used for by optical fiber be connected merge cells and connect, be installed on the earth potential side of electronic mutual inductor, dynamically adjust the correction factor of described collector according to the performance of described sensor, described collector and described sensing head are complementary; By sampling system described input signal is collected digital signal, described digital signal is exported to merge cells by optical fiber;
Described merge cells is used for the digital signal that described collector output is come is merged processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
The collector of the ECVT800E4 series electronic formula mutual inductor that the embodiment of the invention provides is mainly used in the little analog acquisition and the sending function that divide the die mould electronic type voltage transformer based on electronic current mutual inductor and the capacitance-resistance of Luo-coil.The structural representation of this embodiment provides a kind of electronic current mutual inductor based on the Luo Shi principle as shown in Figure 5, a kind of structural representation of the electronic type voltage transformer based on the coaxial capacitance voltage divider principle is as shown in Figure 6.
The hardware structure diagram of a kind of above-mentioned ECVT800E4 series collector that this embodiment provides as shown in Figure 7; comprise two-way independently sampling system the input signal from sensing head is gathered; improved the reliability of protection action, met " Q/GDW441-2010 intelligent substation Protection Technology standard " that up-to-date promulgation is netted by state.
Comprise diode, integrating circuit and AD(analog to digital conversion in the sampling system of every road) parts such as circuit, two-way sampling system common buffer also comprises in the above-mentioned collector: controller, UART, two adopt output ports and a sampling pulse input port.Also comprise DC and LDO in above-mentioned collector, above-mentioned DC and LDO can in the situation that do not connect external power source, carry out self power supply to above-mentioned collector.
The embodiment of the invention is utilized the high reliability of FPGA, and the electronic units such as above-mentioned diode, integrating circuit, AD circuit, impact damper, controller and UART are realized by FPGA, and above-mentioned electronic unit all is integrated among the FPGA.
The hardware characteristics of above-mentioned ECVT800E4 series collector is as follows:
A. adopt each phase independent digit.
B. without the hardware adjustment element, by USB mouth configuration parameter.
C. collector guarantees self 0.1% class precision, and sensing head amplitude and phase error are compensated by combiner.
D. the good maintainability of electric loop.When changing collector, exempt from Precision adjustment.Need not again to demarcate.
Above-mentioned ECVT800E4 series collector takes into full account the relatively abominable running environment of process layer in design of hardware and software, takes totally-enclosed cabinet, and the anti-vibration ability of device improves greatly, and relevant criterion is also satisfied in external electromagnetic radiation.Each analog channel is taked quarantine measures, eliminates passage and harasses; Optical fiber and digital output antijamming capability is strong, but long-distance transmissions.
The suitable environment temperature range of above-mentioned ECVT800E4 series collector is wide, and temperature all can work at-40 ℃～+ 80 ℃ environment, can install on the spot.
The insulating property of above-mentioned ECVT800E4 series collector are as follows:
(1) insulation resistance
Install insulation resistance between all circuit and the shell under standard test conditions, be not less than 100M Ω.
(2) dielectric strength
The current-carrying part of device is between shell or the non-conductive metal that exposes, and between electric unrelated each charged conducting channel, can tolerate and exchange 50Hz, voltage 2kV(effective value), last 1min and test, and naked puncture or flashover phenomenon.The aviation terminal is exchanged 50Hz to the shell ability, voltage 500V(effective value), last the 1min test, and naked punctures or the flashover phenomenon.
(3) surge voltage
The current-carrying part of device is between shell or the non-conductive metal that exposes, and between electric unrelated each charged conducting channel, and under the test condition of regulation, the High Voltage Impulse Waveform that can tolerate amplitude and be 5kV is the in short-term impact check of standard lightning wave.It is that the High Voltage Impulse Waveform of 1kV is that the in short-term impact of standard lightning wave is checked that the aviation terminal is subjected to amplitude to the shell ability.In the process of the test, allow to occur not causing the flashover of insulation damages, if there is flashover, the setting check dielectric strength with 75% should meet the demands.
(4) wet-hot aging performance
Can bear the damp heat test of GB/T7261-2008 regulation.Test temperature is+40 ℃ ± 2 ℃, and relative humidity is (93 ± 3) %, and duration of test runs is that each cycle of 48h(is 24h).Before off-test in the 2h, measure each galvanic circle to exposing between non-charged conducting position and the shell, the insulation resistance between electric unrelated each loop, its insulation resistance should be less than 1.5M Ω; Dielectric strength be not less than 2.3.2. regulation dielectric strength trial voltage value 75%.
The port organization schematic diagram of this embodiment provides a kind of above-mentioned ECVT800E4 series collector as shown in Figure 8, the corresponding situation of each port is as follows:
VIN+: positive supply input
VIN-: negative supply input
EARTH: the earth
IN+: positive signal input
IN-: negative signal input
U11: light digital signal output 1 connects combiner
U12: light digital signal output 2 connects combiner
U14: external sync pulse input, UART debug port input (under the debugging mode).
The ECT800-110/SG electronic current mutual inductor that the embodiment of the invention provides is individual struts type electronic current mutual inductor, and this ECVT800E4 series electronic formula current transformer outline overall and installing dimensions figure as shown in Figure 9.Adopt Rogowski coil sensing; the current measurement accuracy is better than the 0.2S/5TPE level; this product range of dynamic measurement is wide; transient characterisitics and measure linear degree are good; insulation technology and manufacturing process are ripe; characteristics such as lightweight (are equivalent to electric pressure conventional weight 1/3); the Collect conversion partial design is the earth potential side below base of mutual inductor; possesses the double A/D system; be two-way independently sampling system input quantity is gathered; antijamming capability is strong, and reliability is high, is applicable to 50Hz; (the analog acquisition conversion of 100A～3000A) of the large electric current of 110kV electric pressure; its output data layout is standard UART; by optical fiber access merge cells, and then reach protective device and process-level network, satisfy the intelligent substation protection; observing and controlling; the requirement of metering.
The insulation resistance test of ECT800-110/SG electronic current mutual inductor is as follows:
Once end applies the 2500V power-frequency voltage over the ground, records insulation resistance and answers＞1000M Ω: be qualified.
Secondary converter power, alarm contact apply the 500V power-frequency voltage over the ground, record insulation resistance＞100M Ω: qualified.
Secondary converter and cable signal end apply the 500V power-frequency voltage over the ground, record insulation resistance＞100M Ω: qualified.
The power-frequency withstand voltage test is as follows:
Once end applies power-frequency withstand voltage 230kV over the ground, lasts 1min: qualified.
The secondary converter power applies power-frequency withstand voltage 2kV over the ground, lasts 1min: qualified.
Secondary converter and cable signal end apply power-frequency withstand voltage 1.5kV over the ground, last 1min: qualified.
The measurement of partial discharge test is as follows:
Once end applies power-frequency withstand voltage 126kV over the ground, and discharge capacity is 3pC, is down to 87kV again, and discharge capacity is 2pC.
Little water test: hydrone content is answered≤150uL/L: qualified.
The leak detection test: SF6 gas year slip answers≤0.5%: qualified.
EMC test is as follows
The dielectric test test is as follows
Test voltage/time 230kV/1min, test result is without puncture, without flashover
Accuracy test
The Verification of Measuring Current Transformer class of accuracy is 0.2S.As follows with reference to " GB/T20840.8-2007 mutual inductor the 8th part: electronic current mutual inductor " relevant regulations:
The measurement accuracy requirement
Measure and use the accuracy test data:
The protective current transformer, class of accuracy is 5P.As follows with reference to " GB/T20840.8-2007 mutual inductor the 8th part: electronic current mutual inductor " relevant regulations:
Protection requires with class of accuracy:
Protection accuracy test data:
By the type approval test of China Power industrial electrical installation quality inspection test center, the situation of specifically testing is with reference to type-test report.This product puts into operation in the change of Anyang Power Supply Company of Henan Electric Power Company Anyang north suburb 110kV intelligence in April, 2011, and the operation proof is as follows.
The product of the 4.2EVT800-110/SG electronic type voltage transformer of the embodiment of the invention is individual struts type electronic type voltage transformer, and this ECVT800E4 series electronic formula voltage transformer (VT) outline overall and installing dimensions figure as shown in figure 10.Adopt coaxial capacitance dividing potential drop sensing, the voltage measurement accuracy is better than 0.2 grade, this product range of dynamic measurement is wide, and transient characterisitics and measure linear degree are good, and insulation technology and manufacturing process are ripe, characteristics such as lightweight (are equivalent to electric pressure conventional weight 1/3), the Collect conversion partial design is the earth potential side below base of mutual inductor, possesses the double A/D system, namely two-way independently sampling system input quantity is gathered, antijamming capability is strong, and reliability is high.Be applicable to the analog acquisition conversion of 50Hz, 110kV electric pressure, its output data layout is standard UART, by optical fiber access merge cells, and then reaches protective device and process-level network, satisfies the requirement of intelligent substation protection, observing and controlling, metering.
The insulation resistance test of above-mentioned 4.2EVT800-110/SG electronic type voltage transformer is as follows:
Once end applies the 2500V power-frequency voltage over the ground, records insulation resistance and answers＞1000M Ω: be qualified.
Secondary converter power, alarm contact apply the 500V power-frequency voltage over the ground, record insulation resistance＞100M Ω: qualified.
Secondary converter and cable signal end apply the 500V power-frequency voltage over the ground, record insulation resistance＞100M Ω: qualified.
The power-frequency withstand voltage test is as follows::
Once end applies power-frequency withstand voltage 230kV over the ground, lasts 1min: qualified.
The secondary converter power applies power-frequency withstand voltage 2kV over the ground, lasts 1min: qualified.
Secondary converter and cable signal end apply power-frequency withstand voltage 1.5kV over the ground, last 1min: qualified.
The measurement of partial discharge test is as follows::
Once end applies power-frequency withstand voltage 126kV over the ground, and discharge capacity is 3pC, is down to 87kV again, and discharge capacity is 2pC.
Little water test: hydrone content is answered≤150uL/L: qualified.
The leak detection test: SF6 gas year slip answers≤0.5%: qualified.
EMC test is as follows:
Dielectric test is as follows:
| Tested circuit | Trial voltage (effective value) | Test case |
| The 1 pair of shell in loop | AC2000V | Without unusual |
| The 2 pairs of shells in loop | AC1500V | Without unusual |
| Between 1～loop, |
AC2000V | Without unusual |
Test voltage/time 230kV/1min, test result is without puncture, without flashover
Accuracy test is as follows:
Measuring with the voltage transformer (VT) class of accuracy is 0.2.As follows with reference to " GB/T20840.7-2007 mutual inductor the 7th part: electronic type voltage transformer " relevant regulations:
Metering requires with the electronic type voltage transformer standard of accruacy:
Metering electronic type voltage transformer accuracy measurement data:
| Magnitude of voltage (percentage of rated voltage) | 80% | 100% | 120% |
| Error (%) | +0.02 | +0.01 | +0.02 |
| Differ (') | +4 | +4 | +3 |
The Verification of Measuring Current Transformer class of accuracy is 3P.As follows with reference to " GB/T20840.7-2007 mutual inductor the 7th part: electronic type voltage transformer " relevant regulations:
Protection requires with the electronic type voltage transformer standard of accruacy:
Protection electronic type voltage transformer accuracy measurement data:
| Magnitude of voltage (percentage of rated voltage) | 2% | 5% | 120% |
| Error (%) | +0.25 | +0.08 | +0.03 |
| Differ (') | +13 | +8 | +3 |
This product has become in Anyang Power Supply Company of Henan Electric Power Company Anyang north suburb 110kV intelligence in April, 2011 and has put into operation by the type approval test of China Power industrial electrical installation quality inspection test center.
The product of the embodiment of the invention is at the north suburb, Anyang 110kV intelligent substation, Jiaozhuo Jiao Nan 110kV intelligent substation is applied, sensor and electronic unit seamless link technology in the electronic mutual inductor of the embodiment of the invention, technology is exchanged in the accuracy free of losses, the application of having succeeded of the correlation techniques such as electronics collecting unit place point position side installation, and be about to large-tonnage product and introduced to the market, enter the intelligence engineering application stage, for the Operation of Electric Systems maintainer simplifies the electronic mutual inductor maintenance procedures, save maintenance time and maintenance cost and bring great economic benefit.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, and the module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the equipment among the embodiment can be described according to embodiment and be distributed in the equipment of embodiment, also can carry out respective change and be arranged in the one or more equipment that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
In sum, the embodiment of the invention is by being installed on collector the earth potential side of electronic mutual inductor, dynamically adjust the correction factor of collector according to the performance of sensor, collector and sensing head are complementary, realized electronics collecting unit and sensing unit seamless link and accuracy free of losses exchange, when simplifying maintenance procedures, improve the convenience that the electronics collecting unit is safeguarded, reduced maintenance and operating cost.Avoided the abominable electromagnetic environment of high-pressure side, prolonged the life-span in electronic type loop, reduced frequency of maintenance, the electronic mutual inductor that safe and reliable, long-life is provided, is easy to safeguard to intelligent grid is for the safe operation of national intelligent grid provides powerful guarantee.
The electronics collecting unit that the embodiment of the invention has solved present electronic mutual inductor existence moves unreliable, the numerous and diverse and high in cost of production problem of maintenance, break the bottleneck of electronic mutual inductor secondary circuit, improved the universality of electronic mutual inductor, shorten maintenance period, simplify maintenance process, make the rapid wear electronic unit of electronic mutual inductor safeguard summary, the process of the field adjustable that cuts off the power supply when electronic unit need to be grown is changed in cancellation, compole is short during on-the-spot the replacing, almost nil, shorten maintenance time, saved maintenance funds.
The embodiment of the invention has improved the universality of electronic mutual inductor, and the popularization of electronic mutual inductor is had impetus, has accelerated the commercialization of electronic mutual inductor, builds intelligent grid powerful guarantee is provided for implementing in full.Follow the development of electronic mutual inductor, can be applied to have wide application space and market efficiency in the secondary electron loop of any electronic mutual inductor.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. an electronic mutual inductor is characterized in that, comprising: sensing head, collector and merge cells,
Described sensing head, be used for by shielded cable be connected collector and connect, send input signal to described collector;
Described collector, be used for by optical fiber be connected merge cells and connect, be installed on the earth potential side of described electronic mutual inductor, the correction factor of described collector is dynamically adjusted according to the performance of described sensor, and described collector and described sensing head are complementary; By sampling system described input signal is collected digital signal, described digital signal is exported to merge cells by optical fiber;
Described merge cells is used for the digital signal that described collector output is come is merged processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
2. electronic mutual inductor according to claim 1 is characterized in that:
Described collector comprises independently sampling system of impact damper, controller, Universal Asynchronous Receiver ﹠ dispensing device UART and two-way, comprises diode, integrating circuit and analog to digital conversion AD circuit in the sampling system of every road, two-way sampling system common buffer.
3. electronic mutual inductor according to claim 2 is characterized in that, the described diode in the described collector, integrating circuit, AD circuit, impact damper, controller and UART realize by on-site programmable gate array FPGA.
4. electronic mutual inductor according to claim 3 is characterized in that:
Described collector also comprises direct current DC and low pressure difference linear voltage regulator LDO, and described DC and LDO power to described collector in the situation that described collector does not connect external power source.
5. electronic mutual inductor according to claim 1 is characterized in that, described collector is taked totally-enclosed cabinet, and each inner analog channel is taked quarantine measures.
6. the implementation method of an electronic mutual inductor is characterized in that, comprising:
Sensing head is connected with collector by shielded cable, and described sensing head sends input signal to described collector;
Described collector is installed on the earth potential side of electronic mutual inductor, by the correction factor of the described collector of dynamic adjustment, described collector and described sensing head is complementary; Described collector collects digital signal by sampling system to described input signal, and described digital signal is exported to merge cells by optical fiber;
Described merge cells by optical fiber be connected collector and connect, the digital signal that described collector output is come merges processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
7. the implementation method of electronic mutual inductor according to claim 6 is characterized in that, described correction factor by the described collector of dynamic adjustment is complementary described collector and described sensing head, comprising:
The correction factor that described collector is set has dynamic adjustment capability;
Dynamically adjust the correction factor of described collector according to the specific performance of described sensing head, described collector and described sensing head are complementary, the specific performance of the correction factor after the adjustment of described collector and described sensing head is carried out association store;
When described collector breaks down, with new collector be connected sensing head and connect, inquire about the information of described association store according to the specific performance of described sensing head, obtain the correction factor after the adjustment of described storage, the correction factor after the described adjustment is written in the described new collector.
8. the implementation method of electronic mutual inductor according to claim 6 is characterized in that, described collector collects digital signal by sampling system to described input signal, comprising:
Independently sampling system of two-way is set in described collector, comprise diode, integrating circuit and AD circuit block in the sampling system of every road, two-way sampling system common buffer also arranges in described collector: controller, UART, two employing output ports and a sampling pulse input port;
Described collector by described two-way independently sampling system respectively described input signal is gathered, when described collector is applied in capacitance-resistance and divides the die mould electronic type voltage transformer, by the backoff algorithm of SF6 state, realize accuracy compensation and gamma correction to described sensing head.
9. the implementation method of electronic mutual inductor according to claim 6 is characterized in that, the output format of described collector is standard UART, adopts industrial standard UART circuit and described merge cells to carry out the asynchronous data stream communication.
10. according to claim 6 to the implementation method of 9 each described electronic mutual inductors, it is characterized in that, the output data of described merge cells represent the size of primary current voltage, the size of described current/voltage realizes by the passage coefficient of adjusting, and the described passage coefficient of adjusting calculates according to rated current and the specified output of electronic mutual inductor.
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| CN104459300A (en) * | 2014-12-23 | 2015-03-25 | 国家电网公司 | Strut type combination electronic transformer combined with disconnecting switch |
| CN104569532A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Collecting-combining-integrated device of electronic transformer |
| CN106501580A (en) * | 2016-12-23 | 2017-03-15 | 中国西电电气股份有限公司 | A kind of integrated form isolation circuit breakers and its electronic transformer collector |
| CN107743589A (en) * | 2015-03-20 | 2018-02-27 | Abb瑞士股份有限公司 | Using the high-tension measurement unit of self-correcting |
| CN107907848A (en) * | 2017-10-27 | 2018-04-13 | 国网浙江省电力公司杭州供电公司 | detection method for electronic mutual inductor |
| CN111198288A (en) * | 2020-02-17 | 2020-05-26 | 中国人民解放军海军工程大学 | High-voltage signal acquisition system based on optical fiber transmission and acquisition method thereof |
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| CN104459300A (en) * | 2014-12-23 | 2015-03-25 | 国家电网公司 | Strut type combination electronic transformer combined with disconnecting switch |
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| CN106501580A (en) * | 2016-12-23 | 2017-03-15 | 中国西电电气股份有限公司 | A kind of integrated form isolation circuit breakers and its electronic transformer collector |
| CN106501580B (en) * | 2016-12-23 | 2020-01-03 | 中国西电电气股份有限公司 | Integrated isolation circuit breaker and electronic transformer collector thereof |
| CN107907848A (en) * | 2017-10-27 | 2018-04-13 | 国网浙江省电力公司杭州供电公司 | detection method for electronic mutual inductor |
| CN111198288A (en) * | 2020-02-17 | 2020-05-26 | 中国人民解放军海军工程大学 | High-voltage signal acquisition system based on optical fiber transmission and acquisition method thereof |
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